[Users] extraneous 408's

Hello,
Since upgrading to 1.2 we have begun to see lots of extraneous 408 messages.
The CSEQ indicates they are associated with INVITE transactions.
Weird thing is they happen well after the INVITE transaction is complete.
Any ideas on how I can figure out what is going on here?
These are generated by openser not proxied from another source.
Tim
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